Safety device for elevators.



A. KAMPPB.

SAFETY DEVICE FOR ELEVATORS.

APPLIUATION TILED SEPT.24,1910. 980,284, Patented Jan.3, 1911.

f We of, 44% 6 @WG 6J M P i To all who'mit may concern:

UNITED STATES PATENT OFFICE.

AUGI I ST KAMZPFE, or CLEVELAND, 01110.

SAFETY DEVICE FOR ELEVATORS.

Specification of, Letters Patent.

Application fll e'dfseptember 24, 1910. Serial No. 583,595.

I and numbered 943,939.

In the said device I have a construction adapted to lock an elevatorv ata landing in in such manner that the elevator cannot move up or down until the gate has been closed and the locking mechamsm thereby released, and said device comprises a ate with a rack R on its lower edge enga e by a pinion P upon a screw shaft S fixe in a box C at the a landing. Upon said screw there is a crossbar B ada ted to run thereon like a nut and having a-- olt 4 at each end adapted to .be

thrust into holes in the bottom E of the car,

.' so that when a landing is reached and the dooris opened, as usual, the movement of t e oor causes the screw to rotate and to c'arr. the bolts inward into said holes, thus locking the elevators The foregoing construction, however, required something more to make it complete because if the operator should turn on the power before he closed which will his door and while the bolts were still in engagement excessive strains would come on the bolts and somethin would be liable to be broken. Hence I ave devised means prevent theturning on of the power, whet er it be hydraulic, electric or other. ower, before the door is closed and the ho ts' are thereby withdrawn.

The improvement hereintherefore consists 1n mechanism wh1ch Wlll accomplish .this, latter object, as will presently appear elevation in section 0 andas .is set forth in the claims.

'Now,-referring'to the drawin s, Figure 1 is asectional elevation of an e evator construction showing a landing and a car at the landing in locked osition. Fig. 2 is an t the same parts from a different pointof view as hereinafter de scribed. Fig. 3 is a lan view of the mechanism in one of its lhrms and Fig. 4 is a 'pelripective view of a modification thereof.

' avin reference-to the parts in the .said

. patent, represents the floor of the elevator irided with a rack R'at its bottom. The

eer 'carand G'the gate therein adapt- 'ed' to li-de back and forth as usual and prosaid rack is enga ed b a pinion P upon a screw threaded shaft fixed in a suitable box 0 in the landing and in the side of which box the bolts 4 are mounted.

L represents the power controlling lever adapte to be operated as such levers usuall are and which governs the power by whic the elevator is operated. In this case also as in my former construction, the elevator man has to do simly with the operating lever L and the gate and the mec anism for locking the said lever to prevent operation while the' gate is open is governed from the gate through the bolts 4. One form of 'such mechanism is seen in Figs. 1, 2 and 8, and another and possibly a more simple form in Fig. 4. Thus, referring first to Fig. 4,, A represents an arm pivoted at a at itslower portion in the bottom ofthe car and extend- 111g beneath its pivot in right angled" or crank like formation in this instance to brin it into contact relation with one of the ocking bolts 4, a s iral or equivalent spring serving to norma press a ainst the lower end of said arm. or lev out of contact at the top with the operatin lever L. The said arm A has a right angle portion at its top provided with an open Patented Jan. 3, 1911. i

er an throw it slot a adapted to come astride of the lever L and when thusv positioned to lock the lever against operation, the -pivot a and its bearings at that oint being of such strength as .to hold the ever A" in rigid position ed wise, thus also making it vfirm as a gr' or lever L as indicated 1n Fi 3. It follows, of course, that when the b0 t 4 is thrust into engagement with the car throu h the bore or be e d in the car bottom the bo t 4 will press against the lower end of arm A and force its upper end into lockingl engagement "with lever L. On' the other and when the said bolt is withdrawn by closing the door the spring b comes into action and throws the said arm A back out of engagin relations withlever L, thus'liberating said lever for operationas ordinarily.- The same general principle obtains in the other form of this evice shown in Figs. 1, 2 and 3, excepting that in this form the bolt 4 en ages the short arm of a crank lever 8 whic has a sprin 9 connected with the longer end thereo and a link 10 connects between the said long end and the lower end of the arm A. Spring l1ng lever, andmeans operatlvely engaged byone of saidbolts adapted 'to lock said lever against operation while the elevator:

but any 'suita .car at a landing comprising aicarria ge and 'a gate and a lever to control the power, in-

combination with means to prevent the operation of said lever. whilethe gate remains open, said means having automatic "operating connection with the'mechanism locking the elevator carriage. 2. In elevators,1a 'car and elevator gate and mechanism adapted to lock-the ,car at a landing controlled by said gate the same comprlsmg locking bolts actuated fromthe ate, ineombinatio'n with a power control-,.

gate is 'open.

6, 8 v .I a a 33'. An elevator earria'ge and gate, a boltto lock the carriage at a landing having con trolling connection with the bottom of the door, in combination with a power lever and means to lock said lever and prevent operation thereof while the gate is open comprising a pivoted arm adapted to engage the said lever and operating-connections between the said I f arm and said bolt.

4. An elevator carriage and gate and a landing and a device comprising locking bolts a apted to hold said carriage at said v landing whenthe gate is open, in combination with a lever to turn on the power. and means operatively engaged by one of said bolts adapted to locksaid lever when the gateis open and] prevent 'the lever from be operated.- I

in I

ntestimony whereof I afiix my signature I in the presence of two Witnesses.

. AUGUST, KAMPFE'. Witnesses: l

E. MQFISHER, F. G. 'MUssUN, 

